Unleaded Fuel, Did the 914/6 2.0 use Leaded Fuel? Options

[Jeffs9146]

As it says above, does the original 2.0 914/6 use leaded fuel or is unleaded ok? The book says 98 octain but it doesn't say anything about Leaded or Unleaded. My 74 had an Unleaded Only sticker but the 6 doesn't!

Jeff

[mikester]

Just a note, check the method used to calculate the octane rating.

The octane rating is ROZ/RON where as pump octane is calculated as (R+M)/2. The label inside my porsche shows the method used; with a 91 as the number. The factory sticker is for RON only where as pump octane is an average of RON and MON ((R+M)/2). If your engine is not stock and of higher compression or not properly cooled and running warm then more octane may be required but a stock engine (4 cylinder, I don't have a six so I don't know sixes) with proper cooling shouldn't require any a higher than 87 octane rating. If you've got the european domed pistons, your compression ratio is higher, thus it may require higher octane to reduce preignition.

Octane does not prevent the fuel from burning per say, it prevents uncontrolled burning. With proper compression, cooling and timing you won't have to waste money on higher octane to get the proper performance from your engine.